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Derivatives and Other Financial Instruments - Schedule of Reconciliation of Activity for Derivative Contracts (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Embedded Aluminum Derivative [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets, Beginning balance $ 680 $ 266
Fair value measurement, Assets, Sales (2) 11
Fair value measurement, Assets, Cost of goods sold (25) (70)
Fair value measurement, Assets, Other income, net (4) (5)
Fair value measurement, Assets, Other comprehensive loss 229 680
Fair value measurement, Assets, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Assets, Transfers into and/or out of Level 3 0 0
Fair value measurement, Assets, Foreign currency translation (3) (7)
Fair value measurement, Assets, Ending balance 875 875
Fair value measurement, Assets, Sales 0 0
Fair value measurement, Assets, Cost of goods sold 0 0
Fair value measurement, Assets, Other income, net (4) (5)
Fair value measurement, Liabilities, Beginning balance 298 376
Fair value measurement, Liabilities, Sales (3) (14)
Fair value measurement, Liabilities, Cost of goods sold 0 0
Fair value measurement, Liabilities, Other comprehensive loss (72) (139)
Fair value measurement, Liabilities, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Liabilities, Transfers into and/or out of Level 3 0 0
Fair value measurement, Liabilities, Ending balance 223 223
Fair value measurement, Liabilities, Sales 0 0
Fair value measurement, Liabilities, Cost of goods sold 0 0
Embedded Credit Derivative [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Liabilities, Beginning balance 19 18
Fair value measurement, Liabilities, Cost of goods sold 0 0
Fair value measurement, Liabilities, Other income, net 13 14
Fair value measurement, Liabilities, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Liabilities, Transfers into and/or out of Level 3 0 0
Fair value measurement, Liabilities, Ending balance 32 32
Fair value measurement, Liabilities, Sales 0 0
Fair value measurement, Liabilities, Cost of goods sold 0 0
Fair value measurement, Liabilities, Other income, net 13 14
Energy Contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value measurement, Assets, Beginning balance   2
Fair value measurement, Assets, Other comprehensive loss   (2)
Fair value measurement, Assets, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Assets, Transfers into and/or out of Level 3 0 0
Fair value measurement, Assets, Sales 0 0
Fair value measurement, Assets, Cost of goods sold 0 0
Fair value measurement, Liabilities, Beginning balance 9  
Fair value measurement, Liabilities, Cost of goods sold 0 0
Fair value measurement, Liabilities, Other comprehensive loss (5) 4
Fair value measurement, Liabilities, Purchases, sales, issuances, and settlements 0 0
Fair value measurement, Liabilities, Transfers into and/or out of Level 3 0 0
Fair value measurement, Liabilities, Foreign currency translation 1 1
Fair value measurement, Liabilities, Ending balance 5 5
Fair value measurement, Liabilities, Sales 0 0
Fair value measurement, Liabilities, Cost of goods sold $ 0 $ 0